Reinaldo Costa | Ifmg - Academia.edu (original) (raw)
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Papers by Reinaldo Costa
The use of LED lamps has increased in recent years mainly due to their high luminous efficacy and... more The use of LED lamps has increased in recent years mainly due to their high luminous efficacy and long lifetime. However, the nonlinear characteristic of this type of load results in a representative generation of harmonics. Thus, the present article seeks to understand in more detail the impact of LED lighting on the electrical system. So, a computational model was implemented in MatLab MR software from the harmonic components of different lamps obtained experimentally. This model enables the analysis of harmonic distortion and power factor of LED lamps combinations of different power and manufacturers, adding dynamism to the analysis of a electric power system with several LED lamps connected. Simulations were performed with combinations of 9 lamps and the six most critical cases were selected. The most critical combination of lamps resulted in a total harmonic distortion up to 114.5 % with power factor of 0.648. In this case, a passive filter implementation allowed the reduction ...
Brazilian Journal of Development, 2020
Muitos acidentes no trânsito estão associados ao cansaço do motorista. Com o intuito de desenvolv... more Muitos acidentes no trânsito estão associados ao cansaço do motorista. Com o intuito de desenvolver um sensor que detecta essa fadiga este trabalho apresenta um assistente virtual para direção, utilizando visão computacional integrada ao Assistente do Google, de maneira a recomendar, em tempo real, sugestões para o motorista de repouso. Os resultados realizados com dois motoristas demonstram o potencial desse sensor em auxiliar na direção.
The use of LED lamps has increased in recent years mainly due to their high luminous efficacy and... more The use of LED lamps has increased in recent years mainly due to their high luminous efficacy and long lifetime. However, the nonlinear characteristic of this type of load results in a representative generation of harmonics. Thus, the present article seeks to understand in more detail the impact of LED lighting on the electrical system. So, a computational model was implemented in MatLab MR software from the harmonic components of different lamps obtained experimentally. This model enables the analysis of harmonic distortion and power factor of LED lamps combinations of different power and manufacturers, adding dynamism to the analysis of a electric power system with several LED lamps connected. Simulations were performed with combinations of 9 lamps and the six most critical cases were selected. The most critical combination of lamps resulted in a total harmonic distortion up to 114.5 % with power factor of 0.648. In this case, a passive filter implementation allowed the reduction ...
Brazilian Journal of Development, 2020
Muitos acidentes no trânsito estão associados ao cansaço do motorista. Com o intuito de desenvolv... more Muitos acidentes no trânsito estão associados ao cansaço do motorista. Com o intuito de desenvolver um sensor que detecta essa fadiga este trabalho apresenta um assistente virtual para direção, utilizando visão computacional integrada ao Assistente do Google, de maneira a recomendar, em tempo real, sugestões para o motorista de repouso. Os resultados realizados com dois motoristas demonstram o potencial desse sensor em auxiliar na direção.